JPH0551382B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Application and Summary of the Invention] The present invention relates to a method of manufacturing a rotating body fixing device, and in particular, a shaft fastening body 1 is attached to a pair of annular wedge bodies.
The present invention relates to a method of manufacturing a rotating body fixing device of the type in which the wedge bodies are fitted with a boss clamping body 2 and the wedge bodies are clamped together in the axial direction.

[Prior Art and Problems] There is a solid and rolling body fixing device having the configuration shown in FIG. 9, which, as shown in the same figure, has a shaft clamping body 1 with a trapezoidal cross section convex on the outer circumferential side, A boss fastening body 2 is arranged at a constant interval on the outer circumference of the boss fastening body 2 and is formed in a trapezoidal cross section convex to the inner circumference side, and a pair of wedge bodies 31 and 32 are inserted from both ends of these gaps. It consists of

In this conventional type, both sides of the shaft clamping body 1 have tapered surfaces T whose diameter gradually increases toward the center of the cross section.
Both sides of the other boss tightening body 2 form tapered surfaces T whose diameter gradually decreases toward the center of the cross section. The wedge bodies 31 and 32 are inserted between these tapered surfaces T and T,
The inner circumferential surfaces of the wedge bodies 31 and 32 are tapered surfaces that match the tapered surface T of the shaft clamping body 1, and the other outer circumferential surfaces are tapered surfaces that match the tapered surface T of the boss clamping body 2. There is. And these wedge bodies 31,3
2, one wedge body 31 is provided with a plurality of through holes 33, 33 parallel to the axis, and the other wedge body 32 is similarly provided with screw holes 34, 34.

In this case, a tightening bolt 4 is inserted from a through hole 33 into a threaded hole 34 with the shaft tightening body 1 externally fitted onto the shaft J and the boss tightening body 2 being inserted into the boss B of the rotating body R. , 4, since each clamping body is provided with a slit S, pressure is applied in the direction in which the shaft clamping body 1 is reduced due to the wedge action between the tapered surfaces, and the boss clamping body 2 is tightened. On the contrary, pressure is applied in the direction of expansion, and the shaft J and the rotating body R are coupled in a rotation transmission state.

In this manner, the rotor fixing device of the above type has an advantage in that it is not necessary to form a keyway in the shaft J and the boss B.

However, in the past, the shaft clamping body 1 and boss clamping body 2 of the above-mentioned type of rotating body fixture were manufactured by cutting in the same way as the wedge bodies 31 and 32, and the productivity and performance of these were manufactured by cutting. There is a problem with this point.

That is, conventionally, an endless ring having a cross-sectional shape matching that of the shaft clamping body 1 or the boss clamping body 2 is manufactured by cutting from a cylindrical body, and then a portion is cut to form the slit S. The shaft clamping body 1 or the boss clamping body 2 is formed by forming the shaft clamping body 1 or the boss clamping body 2. Therefore, in each conventional tightening body, burrs and the like tend to remain in the portion where the slit S is formed.

The existence of this burr is caused by the fact that when a rotating body fixture is installed between the shaft J and the boss B and the two are fastened together, the shaft J
This appears as an eccentricity between the rotating body R and the rotating body R. In other words, there is a problem that the mounting accuracy of the rotating body R cannot be sufficiently improved.

In addition, when cutting the pair of tapered surfaces of each of the clamping bodies from the cylindrical body, it is necessary to change the chucking posture of the machine tool, and the accuracy of the coaxiality of both tapered surfaces T, T is unstable. Enough is enough. This results in a decrease in the mounting accuracy of the rotating body R.

Since the wedge bodies 31 and 32 are in the shape of an endless ring, and the chuck change as described above is not necessary, there is no problem as described above.

The present invention has been made in view of these points, and consists of ``a pair of tapered surfaces T, T whose inner end surface has a smaller radial width than that of the outer end surface, and whose inner and outer circumferences are substantially symmetrical to each other. Endless link-shaped wedge body 31,
32 are arranged facing each other, and a part has a slit S in the axial direction.
A shaft clamping body 1 and a boss clamping body 2, which are provided with
4 to tighten the shaft clamping body 1 in the axial direction.
In order to prevent eccentricity during fastening of the rotating body, the slits of each clamping body should be free from burrs, etc. in the rotating fixture which pressurizes the boss clamping body 2 to the boss B side. The object is to reduce the eccentricity between the axis J and the rotating body R that is caused by this, without causing any residual eccentricity.

<<Regarding the invention of claim 1>> [Means for solving the problem] The technical means of the present invention taken to solve the above problem is as follows: ``The wedge bodies 31 and 32 are manufactured by cutting, Shaft clamping body 1 and boss clamping body 2
A belt-shaped body F having a certain length and a cross-sectional shape similar to that of the above-mentioned belt F is rolled and bent while being slightly rolled to form a partially open annular body.

[Function] Since each tightening body is manufactured by roll bending, even if the annular body as a whole is insufficient in roundness, at least the annularly formed shaft tightening The cross sections of the attached body 1 and the boss fastening body 2 are formed uniformly.

On the other hand, both wedge bodies 31 and 32 are manufactured by cutting. Therefore, when the rotating body R is assembled into the rotating body fixture and fastened to the shaft J, the shaft clamping body 1 and the boss clamping body 2 are accurately set in a concentric state.

In addition, since each clamping body is bent in a slightly rolled state, the tapered surface T etc. are finished to a smoothness that imitates the roll surface of roll bending.
It is in a state where a certain degree of work hardening has occurred. Therefore, when the tapered surfaces are tightened in the axial direction in a manner such that they are in pressure contact with each other, this tightening force is smoothly converted into a tightening force in the radial direction between the shaft and the rotating body.

Further, since each tightening body is formed by bending a band F cut into a predetermined size into an annular shape, the slit S portion will not have any burrs or burrs. Moreover, even if very slight burrs or burrs remain, even if there are very small burrs or burrs, they will be crushed during roll bending. Therefore, when used as a rotating body fixture, the clamping force for clamping these in the axial direction is efficiently converted into shaft clamping force.

Furthermore, since the dimensional accuracy of the final cross-sectional shape is determined by the roll spacing during roll bending and the accuracy of these rolls, the inner and outer processed parts, such as those manufactured by cutting, are In other words, the cross section of the shaft clamping body 1 or boss clamping body 2 curved from the band-shaped body F has a uniform cross section in the circumferential direction. Even if the roundness etc. are insufficient for
The shaft clamping body 1 and the boss clamping body 2 are located concentrically.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

When the rotating body R is assembled into the rotating body fixing device and fastened to the shaft J, the shaft clamping body 1 and the boss clamping body 2 are accurately set in a concentric state.
The mounting accuracy of the rotating body is improved.

Since the axial tightening force is smoothly converted into the radial tightening force between the shaft and the rotating body, the tightening effect when tightening in the axial direction to fix the shaft J and the rotating body R is improved.

Since no burrs or burrs occur in the slit S portion, there is no possibility of installation failure of the rotating body due to burrs or burrs.

Furthermore, since the belt-shaped body F, which has been previously manufactured to a predetermined cross-sectional shape, is bent into an annular shape, there is no waste of material as would be the case when manufacturing by cutting.

In addition, since the portion corresponding to the tapered surface T is rolled during roll bending, it becomes a smooth surface, and with the tapered surfaces T and T facing each other, the axis J
The tightening effect when tightening in the axial direction to fix the rotating body R is improved.

<<Regarding the invention of claim 2>> The invention of claim 2 is the invention of claim 1, which comprises:
The object of the present invention is to limit the manufacturing method of the shaft fastening body 1 and the boss fastening body 2 so that they can be completed without the need for finishing correction and the accuracy can be improved.

[Means for Solving the Problems] The technical means of the present invention taken to solve the above problems is as follows: When rolling and bending the band-shaped body F slightly to form a partially open annular body, an inclined surface K corresponding to the pair of tapered surfaces T, T of the shaft clamping body 1 or the boss clamping body 2,
The belt-shaped body F provided with K is cut into a length slightly shorter than the developed length of these shaft clamping bodies 1 or boss clamping bodies 2, and the pressing force by each roll for the rolling during the roll bending is , the central part of the cross section of the strip F is pressurized more strongly than the other side, and the slopes K, K
Then, the pressure is gradually increased from the thin wall part to the thick wall part, so that the cross section after the bending is completed is the shaft clamping body 1.
Alternatively, the cross section of each roll was set to match the cross section of the boss clamping body 2.

[Operation] The above technical means of the present invention operates as follows.

According to the method of the present invention, a long strip F manufactured in advance with a predetermined cross-sectional shape is cut into a predetermined length,
Thereafter, when this is rolled and bent into a ring shape having a partially open portion, the shaft clamping body 1 or the boss clamping body 2 is completed.

Here, the band shape F is previously formed into an appropriate cross section by rolling, extrusion, or the like. During roll bending, the pressing force applied by each roll is applied more strongly to the central part of the cross-section of the strip F than the other, and gradually increases from the thinner part to the thicker part on the inclined surfaces K and K. It is rolled and bent under pressure.

Since the cross-sectional shape of the strip F is trapezoidal, with respect to the neutral axis N during bending,
Each section is asymmetrical. Therefore, if the pressure applied by the rolls is constant throughout the contact area between the rolls and the strip F, then when the bending process by the rolls is completed, the center of this unit cross section perpendicular to the neutral axis N A unit cross section which is located away from the neutral axis N and on the outside in the bending direction tends to be bent closer to the neutral axis N. (See Figure 5.) However, since the pressure applied by the rolls is set as described above, the part where the maximum bending stress acts is strongly rolled, and the shaft clamping body 1 or the boss clamping The straight section of the attached body 2 is curved into an annular shape while being maintained in a straight line. That is, the cross-sectional shape of the band-shaped body F is formed into the final cross-sectional shape while the side that contacts the shaft clamping body 1 or the boss clamping body 2 is maintained straight. Further, the entire structure is bent into an annular shape having an open portion in part.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

The shaft clamping body 1 or the boss clamping body 2 can be completed by simply rolling and bending the band-shaped body F cut to a predetermined size into an annular body having an open end.
Productivity is further improved compared to conventional machining. More specifically, since no deformation occurs in the cross section of each clamping body upon completion of roll bending, there is no need for correction work after roll bending.

<<Regarding the invention of claim 3>> The invention of claim 3 specifies the cross-sectional shape of the strip F of the invention of claim 2 and the cross-sectional shape of one of the rolls during roll bending. This prevents the belt-shaped body from meandering during the process.

The configuration specified for this purpose is ``concave grooves on the inclined surface K of the thick part of the strip F, on the surface on the K forming side.''
1, and an annular rib that fits into the groove is formed on the roll facing the roll.

With this method, the ribs on the rolls function as guides during roll bending, and when the strip F is inserted between the rolls, the strip remains perpendicular to the rolls. As a result, meandering of the strip F during roll bending can be prevented. Therefore, the flatness of both ends of the shaft clamping body 1 or boss clamping body 2 in the axial direction is improved.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 9.

The rotating body fixing device of this embodiment has the same form as the rotating body fixing device of the type shown in FIG. The shaft clamping body 1 or boss clamping body 2 is manufactured by rolling.

Since the wedge bodies 31 and 32 are manufactured by cutting in the same manner as in the past, the method for manufacturing these fastening bodies will be described in detail below.

The shaft clamping body 1 is manufactured by the method shown in FIGS. 1 to 4.

The cross-sectional shape of the shaft clamping body 1 manufactured by this method is a trapezoidal cross-section with a groove 11 formed at the center top, as shown in FIGS. 2 and 4. The inclination angles of the inclined surfaces K, K formed at both ends of the cross-section of the strip-shaped body F, which is the material to be used, are set to be larger than the inclination angle of the tapered surface T with respect to the axis of the shaft fastening body 1, as shown in the same figure. ing.
In this method, the belt-shaped body F having the cross-sectional shape is
The shaft fastening body 1 is manufactured by winding it into a coil. Therefore, as shown in FIG. 3, the strip F drawn out from the coil is shaped into a straight line through a roller leveler L, and the strip F is linearized to form a circle around the shaft clamping body 1. A standard length material for the shaft fastening body 1 as shown in FIG. 2 is manufactured by cutting it to a length slightly shorter than the length that matches the circumference. At this time, if there are large burrs or burrs on the cut end,
Remove it at this stage.

Next, the band F is roll-bent into an annular shape. As shown in FIGS. A roll bending device with rolls 52 is used.

In the roll bending device for bending the shaft clamping body 1, the annular recesses of the lower rolls 51, 51 are shaped into a cross-sectional shape on the outer peripheral side of the shaft clamping body 1, as shown in FIG. They are configured to have matching cross-sectional shapes, and the other upper roll 52 is a roll with a smooth surface. In this roll bending device, the lower rolls 51, 51 are configured to be able to rise and fall integrally.

With this upper roll 52 in a driving state, the belt-like material F cut into a regular length as described above is transferred to the lower roll 51,
51 and the upper roll 52, the strip F is bent as shown in FIG.

At this time, as shown in FIG. 4, so that the inclined surface K shown by the imaginary line becomes the tapered surface T shown by the solid line.
The center part of the band-shaped body F is bent in a rolled state where the center part is more strongly pressed than the other part. In particular, on the inclined surface K, the pressure is gradually increased from the thin wall portion to the thick wall portion.

Therefore, deformation as shown by the solid line in FIG. 5, that is, bending in which the center of the thick portion of the inclined surface K shifts toward the neutral axis N side, can be prevented.

This point will be explained in further detail.

When a rod-shaped body with an irregular cross section is bent, stress occurs in opposite directions on the inside and outside of the bending direction with the neutral axis as a boundary, and this stress distribution is as shown in FIG. Therefore, the inner circumference in the bending direction is compressed in the circumferential direction, and conversely, the outer circumference in the bending direction is stretched, and the cross-sectional shape shown by the imaginary line in the same figure is the one shown in the figure in practice. Deforms into a cross-sectional shape.

However, in the method of this embodiment, the pressure applied by the rolls is set to zero or the minimum at the portion where the maximum compressive force occurs due to rolling, and then the pressure applied by the rolls is gradually increased toward the portion where the maximum tensile stress occurs. As a result, the bending process is performed in a manner that offsets the elongation or contraction caused by the stress. Therefore, bending deformation of the cross section after roll bending is completed can be prevented.

In particular, in this embodiment, since the concave groove 11 is formed in the thick part at the center of the strip F, the neutral axis N is located closer to the thick part of the inclined surface K. In this respect as well, the degree to which the center of the thick portion shifts toward the neutral axis N after the bending process is reduced. Furthermore, the groove 11 functions as a guide during roll bending. That is, the lower rolls 51, 51 and the upper roll 5
2, the ribs 50, 50 corresponding to the grooves 11 on the lower roll 51 side fit into the grooves 11, so that the completed shaft tightening The ring shape of the attached body 1 becomes accurate.

Next, in the case of the boss clamping body 2, the shaft clamping body 1
However, in this example, a strip F having the same cross section as in the above example is used,
The length of the standard length material is set to be slightly shorter than the length that matches the circumference of the boss tightening body 2.

In addition, as shown in FIG. 7, the roll bending device has an annular recess 53 formed in the upper roll 52, as shown in FIG. 8, contrary to the case of the first embodiment. , a rib 50 corresponding to the groove 11
and a tapered surface that is in contact with the inclined surface K, and is made to match the cross section of the inner peripheral side of the final finished shape of the boss fastening body 2. In this case, contrary to the case of manufacturing the shaft fastening body 1, the belt-like body F having the cross-sectional shape shown by the imaginary line is made as shown by the solid line in the same figure.
The inclined surface K is rolled and bent in such a manner that the thin-walled portion side is strongly pressurized.

When the band-shaped body F is bent into an annular shape in this manner, the boss fastening body 2 is completed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the roll bending process according to the embodiment of the present invention, and FIG. 2 is a perspective view of a standard length material obtained by cutting the strip F to the circumferential length of the shaft clamping body 1 or boss clamping body 2. ,
FIG. 3 is an explanatory diagram of the process of cutting the standard length material from the coiled strip F, FIG. 4 is a detailed diagram of the main parts of the roll bending device shown in FIG. 1, and FIG. Explanatory diagram of cross-sectional change in case of roll bending, No. 6
The figure is an explanatory diagram of the stress distribution in the cross section in this case, Figure 7 is an explanatory diagram of the roll bending process in which the boss clamping body 2 is bent, Figure 8 is a detailed diagram of this bending part, and Figure 9 is an illustration of the main body. It is an explanatory view of a rotary body fixing device which is an object of carrying out the manufacturing method of the invention, and in the figure, 1...shaft fastening body, 2...boss fastening body, T...tapered surface, K...slanted surface, F... Band-shaped body, J...
Axis, B...Boss.

Claims (1)

[Scope of Claims] 1. A pair of endless ring-shaped wedge bodies 31 whose inner end faces have a smaller radial width than their outer end faces, and whose inner and outer circumferences have tapered surfaces T, T that are substantially symmetrical to each other;
32 are arranged facing each other, and a part has a slit S in the axial direction.
A shaft clamping body 1 and a boss clamping body 2, which are provided with
4 in the axial direction to press the shaft clamping body 1 to the axis J side and the boss clamping body 2 to the boss B side, respectively.
2 by cutting, and the shaft clamping body 1 and the boss clamping body 2 are partially rolled and bent by slightly rolling a belt-shaped body F of a certain length with a cross-sectional shape similar to that of the shaft clamping body 1 and the boss clamping body 2. A method for manufacturing a rotating body fixture having an open annular body. 2. When forming the shaft clamping body 1 and the boss clamping body 2 into a partially open annular body by slightly rolling and bending a belt-shaped body F of a certain length with a cross-sectional shape similar to that of the shaft clamping body 1 and the boss clamping body 2, A belt-shaped body F having inclined surfaces K and K corresponding to the pair of tapered surfaces T and T of the clamping body 1 or the boss clamping body 2 is slightly shorter than the unfolded length of the shaft clamping body 1 or the boss clamping body 2. The belt-shaped body F is cut into short lengths, and the pressure applied by each roll for the rolling during the roll bending is applied more strongly to the central part of the cross-section of the belt-like body F than the other side of the shaft clamping body 1. At the same time, on the inclined surfaces K and K, the pressure is applied gradually from the thin wall part to the thick wall part, and for the other boss fastening body 2, the cross-sectional sides of the strip body F are pressurized more strongly than the center part. At the same time, on the inclined surfaces K and K, the pressure is gradually increased from the thick part to the thin part,
The cross section after bending is completed is shaft clamping body 1 or boss clamping body 2
2. The method for manufacturing a rotating solid tool according to claim 1, wherein the cross section of each roll is set to match the cross section of . 3. A recessed groove 11 is formed on the inclined surface K of the thick portion of the strip F, and an annular rib that fits into the recessed groove is formed on the roll facing the recessed groove 11. Item 2. A method for manufacturing a rotating body fixture according to item 2.